Collecting diagnostic information from vCenter Server 5.1

Just though I would put this up as its something I like to keep booked marked and up to date.
The KB provides procedures for obtaining diagnostic information for VMware vCenter Server.

Collecting diagnostic information from vCenter Server 5.1

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1011641